Hello!
You can make skin for a normal scaling (100%) and repeat all required images for 200%, which will to 2 times be bigger.
For selecting of big images you can choose “200%” mode in the skin editor:
[attachment=8960:editscale.jpg]
Vector images are not supported at the moment, just added big sizes images, which are scaled with good quality in the real-time.
Skin Editor tutorials will be updated soon.